Which is the strongest acid ($pk_a$ value is given)?

  • A
    $HCOOH\ [3.77]$
  • B
    $C_6H_5COOH\ [4.22]$
  • C
    $CH_3COOH\ [4.7]$
  • D
    $CH_3CH_2COOH\ [4.88]$

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